Hey there,
I'm still thinking about extending comprehension. What about a `then`
option?
for i <- 1..3, do: i, then: &Enum.sum/1
for s <- ~w(a b c), do: s, then: &Enum.join(&1, ", ")
(I know this can be achieved more efficiently with a reduce, but sometimes
concise syntax is a better choice)
Le mardi 21 juin 2022 à 18:40:46 UTC+2, José Valim a écrit :
> It should probably be done with using `into: joiner(",")`, where the
> joiner implements the collectable protocol. join itself probably doesn't
> make much sense because it doesn't play well with other options such as
> :into itself, or :reduce.
>
> On Tue, Jun 21, 2022 at 6:15 PM Christian Blavier <cbla...@gmail.com>
> wrote:
>
>> Do you think a join option would be a good idea for comprehensions?
>> Something like Enum.map_join/2 that could map and join lists in a single
>> pass.
>> book_ids = for book <- books, join: ",", do: book.id
>>
>> If it looks like a good idea, I will open a PR.
>>
>> Best,
>>
>> Christian
>>
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